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Use ReadOnlyByteArrayView in PatriciaTriePolicy.

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Change-Id: I4ef01c0af73f27c256cc1a719343be836913dc71
This commit is contained in:
Keisuke Kuroyanagi 2014-09-17 21:38:46 +09:00
parent fc7d0540fe
commit 180e7b4c07
3 changed files with 59 additions and 44 deletions
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79
native/jni/src/suggest/policyimpl/dictionary/structure/v2/patricia_trie_policy.cpp
View File

@ -37,19 +37,19 @@ void PatriciaTriePolicy::createAndGetAllChildDicNodes(const DicNode *const dicNo
return;
}
int nextPos = dicNode->getChildrenPtNodeArrayPos();
if (nextPos < 0 || nextPos >= mDictBufferSize) {
AKLOGE("Children PtNode array position is invalid. pos: %d, dict size: %d",
nextPos, mDictBufferSize);
if (!isValidPos(nextPos)) {
AKLOGE("Children PtNode array position is invalid. pos: %d, dict size: %zd",
nextPos, mBuffer.size());
mIsCorrupted = true;
ASSERT(false);
return;
}
const int childCount = PatriciaTrieReadingUtils::getPtNodeArraySizeAndAdvancePosition(
mDictRoot, &nextPos);
mBuffer.data(), &nextPos);
for (int i = 0; i < childCount; i++) {
if (nextPos < 0 || nextPos >= mDictBufferSize) {
AKLOGE("Child PtNode position is invalid. pos: %d, dict size: %d, childCount: %d / %d",
nextPos, mDictBufferSize, i, childCount);
if (!isValidPos(nextPos)) {
AKLOGE("Child PtNode position is invalid. pos: %d, dict size: %zd, childCount: %d / %d",
nextPos, mBuffer.size(), i, childCount);
mIsCorrupted = true;
ASSERT(false);
return;
@ -91,56 +91,57 @@ int PatriciaTriePolicy::getCodePointsAndProbabilityAndReturnCodePointCount(
int lastCandidatePtNodePos = 0;
// Let's loop through PtNodes in this PtNode array searching for either the terminal
// or one of its ascendants.
if (pos < 0 || pos >= mDictBufferSize) {
AKLOGE("PtNode array position is invalid. pos: %d, dict size: %d",
pos, mDictBufferSize);
if (!isValidPos(pos)) {
AKLOGE("PtNode array position is invalid. pos: %d, dict size: %zd",
pos, mBuffer.size());
mIsCorrupted = true;
ASSERT(false);
*outUnigramProbability = NOT_A_PROBABILITY;
return 0;
}
for (int ptNodeCount = PatriciaTrieReadingUtils::getPtNodeArraySizeAndAdvancePosition(
mDictRoot, &pos); ptNodeCount > 0; --ptNodeCount) {
mBuffer.data(), &pos); ptNodeCount > 0; --ptNodeCount) {
const int startPos = pos;
if (pos < 0 || pos >= mDictBufferSize) {
AKLOGE("PtNode position is invalid. pos: %d, dict size: %d", pos, mDictBufferSize);
if (!isValidPos(pos)) {
AKLOGE("PtNode position is invalid. pos: %d, dict size: %zd", pos, mBuffer.size());
mIsCorrupted = true;
ASSERT(false);
*outUnigramProbability = NOT_A_PROBABILITY;
return 0;
}
const PatriciaTrieReadingUtils::NodeFlags flags =
PatriciaTrieReadingUtils::getFlagsAndAdvancePosition(mDictRoot, &pos);
PatriciaTrieReadingUtils::getFlagsAndAdvancePosition(mBuffer.data(), &pos);
const int character = PatriciaTrieReadingUtils::getCodePointAndAdvancePosition(
mDictRoot, &pos);
mBuffer.data(), &pos);
if (ptNodePos == startPos) {
// We found the position. Copy the rest of the code points in the buffer and return
// the length.
outCodePoints[wordPos] = character;
if (PatriciaTrieReadingUtils::hasMultipleChars(flags)) {
int nextChar = PatriciaTrieReadingUtils::getCodePointAndAdvancePosition(
mDictRoot, &pos);
mBuffer.data(), &pos);
// We count code points in order to avoid infinite loops if the file is broken
// or if there is some other bug
int charCount = maxCodePointCount;
while (NOT_A_CODE_POINT != nextChar && --charCount > 0) {
outCodePoints[++wordPos] = nextChar;
nextChar = PatriciaTrieReadingUtils::getCodePointAndAdvancePosition(
mDictRoot, &pos);
mBuffer.data(), &pos);
}
}
*outUnigramProbability =
PatriciaTrieReadingUtils::readProbabilityAndAdvancePosition(mDictRoot,
PatriciaTrieReadingUtils::readProbabilityAndAdvancePosition(mBuffer.data(),
&pos);
return ++wordPos;
}
// We need to skip past this PtNode, so skip any remaining code points after the
// first and possibly the probability.
if (PatriciaTrieReadingUtils::hasMultipleChars(flags)) {
PatriciaTrieReadingUtils::skipCharacters(mDictRoot, flags, MAX_WORD_LENGTH, &pos);
PatriciaTrieReadingUtils::skipCharacters(mBuffer.data(), flags, MAX_WORD_LENGTH,
&pos);
}
if (PatriciaTrieReadingUtils::isTerminal(flags)) {
PatriciaTrieReadingUtils::readProbabilityAndAdvancePosition(mDictRoot, &pos);
PatriciaTrieReadingUtils::readProbabilityAndAdvancePosition(mBuffer.data(), &pos);
}
// The fact that this PtNode has children is very important. Since we already know
// that this PtNode does not match, if it has no children we know it is irrelevant
@ -155,7 +156,8 @@ int PatriciaTriePolicy::getCodePointsAndProbabilityAndReturnCodePointCount(
int currentPos = pos;
// Here comes the tricky part. First, read the children position.
const int childrenPos = PatriciaTrieReadingUtils
::readChildrenPositionAndAdvancePosition(mDictRoot, flags, &currentPos);
::readChildrenPositionAndAdvancePosition(mBuffer.data(), flags,
&currentPos);
if (childrenPos > ptNodePos) {
// If the children pos is greater than the position, it means the previous
// PtNode, which position is stored in lastCandidatePtNodePos, was the right
@ -185,30 +187,30 @@ int PatriciaTriePolicy::getCodePointsAndProbabilityAndReturnCodePointCount(
if (0 != lastCandidatePtNodePos) {
const PatriciaTrieReadingUtils::NodeFlags lastFlags =
PatriciaTrieReadingUtils::getFlagsAndAdvancePosition(
mDictRoot, &lastCandidatePtNodePos);
mBuffer.data(), &lastCandidatePtNodePos);
const int lastChar = PatriciaTrieReadingUtils::getCodePointAndAdvancePosition(
mDictRoot, &lastCandidatePtNodePos);
mBuffer.data(), &lastCandidatePtNodePos);
// We copy all the characters in this PtNode to the buffer
outCodePoints[wordPos] = lastChar;
if (PatriciaTrieReadingUtils::hasMultipleChars(lastFlags)) {
int nextChar = PatriciaTrieReadingUtils::getCodePointAndAdvancePosition(
mDictRoot, &lastCandidatePtNodePos);
mBuffer.data(), &lastCandidatePtNodePos);
int charCount = maxCodePointCount;
while (-1 != nextChar && --charCount > 0) {
outCodePoints[++wordPos] = nextChar;
nextChar = PatriciaTrieReadingUtils::getCodePointAndAdvancePosition(
mDictRoot, &lastCandidatePtNodePos);
mBuffer.data(), &lastCandidatePtNodePos);
}
}
++wordPos;
// Now we only need to branch to the children address. Skip the probability if
// it's there, read pos, and break to resume the search at pos.
if (PatriciaTrieReadingUtils::isTerminal(lastFlags)) {
PatriciaTrieReadingUtils::readProbabilityAndAdvancePosition(mDictRoot,
PatriciaTrieReadingUtils::readProbabilityAndAdvancePosition(mBuffer.data(),
&lastCandidatePtNodePos);
}
pos = PatriciaTrieReadingUtils::readChildrenPositionAndAdvancePosition(
mDictRoot, lastFlags, &lastCandidatePtNodePos);
mBuffer.data(), lastFlags, &lastCandidatePtNodePos);
break;
} else {
// Here is a little tricky part: we come here if we found out that all children
@ -220,14 +222,14 @@ int PatriciaTriePolicy::getCodePointsAndProbabilityAndReturnCodePointCount(
// ready to start the next one.
if (PatriciaTrieReadingUtils::hasChildrenInFlags(flags)) {
PatriciaTrieReadingUtils::readChildrenPositionAndAdvancePosition(
mDictRoot, flags, &pos);
mBuffer.data(), flags, &pos);
}
if (PatriciaTrieReadingUtils::hasShortcutTargets(flags)) {
mShortcutListPolicy.skipAllShortcuts(&pos);
}
if (PatriciaTrieReadingUtils::hasBigrams(flags)) {
if (!mBigramListPolicy.skipAllBigrams(&pos)) {
AKLOGE("Cannot skip bigrams. BufSize: %d, pos: %d.", mDictBufferSize,
AKLOGE("Cannot skip bigrams. BufSize: %zd, pos: %d.", mBuffer.size(),
pos);
mIsCorrupted = true;
ASSERT(false);
@ -244,14 +246,14 @@ int PatriciaTriePolicy::getCodePointsAndProbabilityAndReturnCodePointCount(
// our pos is after the end of this PtNode, at the start of the next one.
if (PatriciaTrieReadingUtils::hasChildrenInFlags(flags)) {
PatriciaTrieReadingUtils::readChildrenPositionAndAdvancePosition(
mDictRoot, flags, &pos);
mBuffer.data(), flags, &pos);
}
if (PatriciaTrieReadingUtils::hasShortcutTargets(flags)) {
mShortcutListPolicy.skipAllShortcuts(&pos);
}
if (PatriciaTrieReadingUtils::hasBigrams(flags)) {
if (!mBigramListPolicy.skipAllBigrams(&pos)) {
AKLOGE("Cannot skip bigrams. BufSize: %d, pos: %d.", mDictBufferSize, pos);
AKLOGE("Cannot skip bigrams. BufSize: %zd, pos: %d.", mBuffer.size(), pos);
mIsCorrupted = true;
ASSERT(false);
*outUnigramProbability = NOT_A_PROBABILITY;
@ -402,7 +404,7 @@ int PatriciaTriePolicy::createAndGetLeavingChildNode(const DicNode *const dicNod
int shortcutPos = NOT_A_DICT_POS;
int bigramPos = NOT_A_DICT_POS;
int siblingPos = NOT_A_DICT_POS;
PatriciaTrieReadingUtils::readPtNodeInfo(mDictRoot, ptNodePos, &mShortcutListPolicy,
PatriciaTrieReadingUtils::readPtNodeInfo(mBuffer.data(), ptNodePos, &mShortcutListPolicy,
&mBigramListPolicy, &flags, &mergedNodeCodePointCount, mergedNodeCodePoints,
&probability, &childrenPos, &shortcutPos, &bigramPos, &siblingPos);
// Skip PtNodes don't start with Unicode code point because they represent non-word information.
@ -452,14 +454,16 @@ const WordProperty PatriciaTriePolicy::getWordProperty(
int shortcutPos = getShortcutPositionOfPtNode(ptNodePos);
if (shortcutPos != NOT_A_DICT_POS) {
int shortcutTargetCodePoints[MAX_WORD_LENGTH];
ShortcutListReadingUtils::getShortcutListSizeAndForwardPointer(mDictRoot, &shortcutPos);
ShortcutListReadingUtils::getShortcutListSizeAndForwardPointer(mBuffer.data(),
&shortcutPos);
bool hasNext = true;
while (hasNext) {
const ShortcutListReadingUtils::ShortcutFlags shortcutFlags =
ShortcutListReadingUtils::getFlagsAndForwardPointer(mDictRoot, &shortcutPos);
ShortcutListReadingUtils::getFlagsAndForwardPointer(mBuffer.data(),
&shortcutPos);
hasNext = ShortcutListReadingUtils::hasNext(shortcutFlags);
const int shortcutTargetLength = ShortcutListReadingUtils::readShortcutTarget(
mDictRoot, MAX_WORD_LENGTH, shortcutTargetCodePoints, &shortcutPos);
mBuffer.data(), MAX_WORD_LENGTH, shortcutTargetCodePoints, &shortcutPos);
const std::vector<int> shortcutTarget(shortcutTargetCodePoints,
shortcutTargetCodePoints + shortcutTargetLength);
const int shortcutProbability =
@ -512,4 +516,9 @@ int PatriciaTriePolicy::getWordIdFromTerminalPtNodePos(const int ptNodePos) cons
int PatriciaTriePolicy::getTerminalPtNodePosFromWordId(const int wordId) const {
return wordId == NOT_A_WORD_ID ? NOT_A_DICT_POS : wordId;
}
bool PatriciaTriePolicy::isValidPos(const int pos) const {
return pos >= 0 && pos < static_cast<int>(mBuffer.size());
}
} // namespace latinime

17
native/jni/src/suggest/policyimpl/dictionary/structure/v2/patricia_trie_policy.h
View File

@ -44,13 +44,12 @@ class PatriciaTriePolicy : public DictionaryStructureWithBufferPolicy {
: mMmappedBuffer(std::move(mmappedBuffer)),
mHeaderPolicy(mMmappedBuffer->getReadOnlyByteArrayView().data(),
FormatUtils::VERSION_2),
mDictRoot(mMmappedBuffer->getReadOnlyByteArrayView().data()
+ mHeaderPolicy.getSize()),
mDictBufferSize(mMmappedBuffer->getReadOnlyByteArrayView().size()
- mHeaderPolicy.getSize()),
mBigramListPolicy(mDictRoot, mDictBufferSize), mShortcutListPolicy(mDictRoot),
mPtNodeReader(mDictRoot, mDictBufferSize, &mBigramListPolicy, &mShortcutListPolicy),
mPtNodeArrayReader(mDictRoot, mDictBufferSize),
mBuffer(mMmappedBuffer->getReadOnlyByteArrayView().skip(mHeaderPolicy.getSize())),
mBigramListPolicy(mBuffer.data(), mBuffer.size()),
mShortcutListPolicy(mBuffer.data()),
mPtNodeReader(mBuffer.data(), mBuffer.size(), &mBigramListPolicy,
&mShortcutListPolicy),
mPtNodeArrayReader(mBuffer.data(), mBuffer.size()),
mTerminalPtNodePositionsForIteratingWords(), mIsCorrupted(false) {}
AK_FORCE_INLINE int getRootPosition() const {
@ -149,8 +148,7 @@ class PatriciaTriePolicy : public DictionaryStructureWithBufferPolicy {
const MmappedBuffer::MmappedBufferPtr mMmappedBuffer;
const HeaderPolicy mHeaderPolicy;
const uint8_t *const mDictRoot;
const int mDictBufferSize;
const ReadOnlyByteArrayView mBuffer;
const BigramListPolicy mBigramListPolicy;
const ShortcutListPolicy mShortcutListPolicy;
const Ver2ParticiaTrieNodeReader mPtNodeReader;
@ -166,6 +164,7 @@ class PatriciaTriePolicy : public DictionaryStructureWithBufferPolicy {
int getTerminalPtNodePosFromWordId(const int wordId) const;
const WordAttributes getWordAttributes(const int probability,
const PtNodeParams &ptNodeParams) const;
bool isValidPos(const int pos) const;
};
} // namespace latinime
#endif // LATINIME_PATRICIA_TRIE_POLICY_H

7
native/jni/src/utils/byte_array_view.h
View File

@ -42,6 +42,13 @@ class ReadOnlyByteArrayView {
return mPtr;
}
AK_FORCE_INLINE const ReadOnlyByteArrayView skip(const size_t n) const {
if (mSize <= n) {
return ReadOnlyByteArrayView();
}
return ReadOnlyByteArrayView(mPtr + n, mSize - n);
}
private:
DISALLOW_ASSIGNMENT_OPERATOR(ReadOnlyByteArrayView);